W83627DHG Datasheet, PDF (187/268 Pages) Winbond – WINBOND LPC I/O

W83627DHG
15.3 Stop Frame
After all IRQ/Data Frames have completed, the host controller will terminates SERIRQ with a Stop
frame. Only the host controller can initiate the Stop Frame by driving SERIRQ low for 2 or 3 clocks. If
the Stop Frame is low for 2 clocks, the Sample mode of next SERIRQ cycle’s Sample mode is the Quiet
mode. If the Stop Frame is low for 3 clocks, the Sample mode of next SERIRQ cycle is the Continuous
mode.
Please see the diagram below for more details.
Stop Frame Timing with Host Using 17 SERIRQ sampling period.
PCICLK
SERIRQ
IRQ14
FRAME
S RT
IRQ15
FRAME
S RT
IOCHCK#
FRAME
SRT
STOP FRAME
I¹ H
RT
STOP
Driver
None
IRQ15
None
Host Controller
NEXT CYCLE
START ²
H=Host Control
R=Recovery
T=Turn-around
S=Sample
I= Idle.
Note:
1. There may be none, one or more Idle states during the Stop Frame.
2. The Start Frame pulse of next SERIRQ cycle may or may not start immediately after the
turn-around clock of the Stop Frame.
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Publication Release Date: Aug, 22, 2007
Version 1.4